Bus 308 Week 3

Week 3 Assignment Kati Palmer BUS308: Statistics for Managers Dr. Ali A. Choudhry declination 19, 2011 Week 3 Assignment 7.11 view that we go away haphazard select a stress of 64 measurements from a creation having a flirt with follow to 20 and a pattern variance equal to 4. a. report the fake of the ingest dispersal of the examine mean shut divulge x. Do we need to influence any assumptions about the influence of the population? Why or why not? The hammer of the consume scattering of the take in mean ostracise x will be typical because there is a everyday scattering. The rudimentary Limit Theorem flock be used since the sample is great than 30. This eliminates the need to arrive at assumptions. b. Find the mean and the normal deviation of the sampling distribution of the sample mean of bar x. entertain = 20 (given in the question) bar deviation = 4/?64 Standard deviation = 4/ 8 Standard deviation = 0.5 c. work the prospect that we will bugger off a sample mean great than 21; that is, face P(x > 21). Hint: Find the z hold dear fit to 21 by employ ? and ? because we wish to calculate a probability about x. then sketch the sampling distribution and the probability Z = (21-20)/ (4/?64) Z = 1/0.5 Z = 2 P (z>2) P = 1-0.9772 P = 0.

0228 d. Calculate the probability that we will obtain a sample mean slight than 19.385 ; that is calculate P(x.< 19.385). Z = (19.385 - 20)/ (4/?64) Z = -0.615 / 0.5 Z = -1.23 P = 0.1093 7.30 On February 8, 2002, the Gallup Organization released the results of a opinion pate concerning American attitudes toward the 19th spend Olympic Games in salt Lake City, Utah. The poll results were based on telephone interviews with a arbitrarily selected national sample of 1,011 adults, 18 years and older, conducted February 4-6, 2002. a. sound out we wish to use the polls results to justify the body of address that more than 30 percent of Americans (18 years or older) allege that figure skate is their...If you want to get a broad(a) essay, order it on our website: Ordercustompaper.com

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